NSDateComponents weekOfYear returns wrong date

Question

so i am making a basic week picker, where you can pick a week number and year, and get the corresponding date from the weeks startpoint.

A basic test scenario

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Answer 1

weekOfYear works in conjunction with yearForWeekOfYear:

let calendar = NSCalendar.currentCalendar()
let components = NSDateComponents()

components.yearForWeekOfYear = 2015
components.weekOfYear = 15

print(calendar.dateFromComponents(components)!)
// 2015-04-05 22:00:00 +0000

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Update for Swift 3 and later:

let calendar = Calendar.current
var components = DateComponents()

components.yearForWeekOfYear = 2015
components.weekOfYear = 15

print(calendar.date(from: components)!)